Nanowire-assisted microcavity in a photonic crystal waveguide and the enabled high-efficiency optical frequency conversions

Linpeng Gu*, Liang Fang, Qingchen Yuan, Xuetao Gan, Yang Hao, Xutao Zhang, Juntao Li, Hanlin Fang, Vladislav Khayrudinov, Harri Lipsanen, Zhipei Sun, Jianlin Zhao

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

We report an indium phosphide nanowire (NW)-induced cavity in a silicon planar photonic crystal (PPC) waveguide to improve the light–NW coupling. The integration of NW shifts the transmission band of the PPC waveguide into the mode gap of the bare waveguide, which gives rise to a microcavity located on the NW section. Resonant modes with 푄 factors exceeding 103 are obtained. Leveraging on the high density of the electric field in the microcavity, the light–NW interaction is enhanced strongly for efficient nonlinear frequency conversion. Second-harmonic generation and sum-frequency generation in the NW are realized with a continuous-wave pump laser in a power level of tens of microwatts, showing a cavity-enhancement factor of 112. The hybrid integration structure of NW-PPC waveguide and the self-formed microcavity not only opens a simple strategy to effectively enhance light–NW interactions, but also provides a compact platform to construct NW-based on-chip active devices.
Original languageEnglish
Pages (from-to)1734-1741
Number of pages8
JournalPhotonics Research
Volume8
Issue number11
DOIs
Publication statusPublished - 22 Oct 2020
MoE publication typeA1 Journal article-refereed

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